You might look at Tropica’s Inspiration page for some comparisons with their Rio 180 (101 x 41cm) layouts - obviously these are grown in with CO2 so you’ll have slower growth but you can look at initial planting density/hardscape/ to have an idea how this will look in your Rio 350 (121 x 51cm footprint)
Given the 66cm height of your tank, I’d not be too concerned about loads of floating plants to reduce light intensity -you want sufficient light PAR at the substrate for plants to transition to aquatic leaf structure
Glancing at your plant numbers (and some idea of your actual scape - photos of the hardscape in place would get you a more considered opinion) it seems a reasonable amount BUT a lot depends on how well the plants have grown on before sale
(note I use mostly1-2-Grow these days)
Unless you’re quite certain of species and pots, some thoughts (I assume you’re planning a sand foreground with no carpeting plants)
Tropica’s Anubias nana ‘Large’ would do well in this larger tank, and always seems to be a generous pot
Anubias Coffeefolia is on sale if you want some contrast color, texture
Anubias angustifolia is also a lovely plant, again if you want some leaf shape contrast in your Anubias
Microsorum pteropus - I’d add 3 of these as they are slow growing and often a dominant plant, so less symmetry is more aesthetically pleasing (I prefer the ‘narrow’ version re leaf texture, color)
Java moss - if you’re planning this for hardscape element, I’d choose a more structured moss such as ‘Spiky’ but if you want that amorphous clump for shrimp/baby fish, this is excellent
Moss portions go a long way, you only need small amounts placed on wood etc (see Jurijs mit JS technique) so unless you’re planning ALOT of moss, 2-3 portions should be enough
Limnobium laevigatum - a single 1-2-grow cup is usually loads
Ludwigia palustris red - red even in moderate lights without CO2
(I added this to a recent scape and the plant looks quite different from previous Tropica version, staff mentioned that it’s now called “super red”)
Lobelia cardinalis- this is a nice midground plant that is a bright green color (good contrast to your mostly darker crypt greens)
Crypt wendtii ‘green’
Crypt x willisii - also a nice green crypt, this has a much more structured leaf (more like parva than the wendtii)
Crypt usteriana - I’d likely go with more of these taller species re the height to the tank
Crypt crispatula (balansae) - as above, a very nice plant in a tall tank, narrow leaf will contrast nicely with usteriana
(I’m thinking of Filipe Oliveira style where complementing plant species are intermingled rather than kept discrete)
Vallisneria nana - a good transition plant to these taller crypt, with similar leaf
Vallisneria spiralis Tiger - can grow quite tall, long leafs and would look amazing in the tall tank
E Bleherae - again not my favourite Echinodorus (it so often seems pale and leafs lined in algae in and there are several other “easy” swords that have more character
)
Tall stem plants
Hygrophila Siamensis - I’d consider adding some of this rather than all 53B (in a taller tank, I always liked Tropica’s previous variety H corymbosa)
Bacopa caroliniana - not my favourite so ignore my objections if you love this plant, I struggle to “fit” it into scapes though it looks wonderful in Pedro Rosa’s high tech aquarium
While lots of fast growing stems are an excellent start to the tank, you’ll likely get tired of trimming, and the lower stems may struggle somewhat re reduced light and non-CO2 (though higher fish stocking can provide a surprising effect)
Ceratophyllum Demersum - see my thoughts above re floating plants, I’d swap this for some Limnophila sessiliflora as this plant will begin growing immediately regardless of non-CO2
Not to dissuade you from your choices or amounts, these are just my thoughts if you’re wanting that sort of input
Pedro Rosa’s Dutch Style Tank shows many of Tropica’s plants at their best
Inspiration and ideas for your planted aquarium.
tropica.com
Going Dutch by the book - tank sponsored by Tropica (I’ve never understood why this isn't in the Featured Journals as it’s such outstanding photos and plant species growth)