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I have a 20L that housed up to 60 RCS without much impact to water parameters before I culled some. Shrimp have a very small bioload. So as long as the filter is well matured and can keep up with breaking down the waste, then you can keep quite a few shrimp. This means you test the water parameters regularly. Choose a filter media that has a large surface area like Marine Pure spheres, and that will help ensure your small filter is capable of keeping up with your livestock in the small tank. I just bought some Marine Pure spheres myself

I have an 8L tank on my desk at work that I started with 2 males & 4 females, by the end of the year I have over 40 in there & they were breeding quite well.

They maintain there size, just need replacing every year or two depending on the water used, just like with substrates, RO & SaltyShrimp will extend their life.

Nah they leave my plants alone

As I mentioned on other forums, you do not need oxygenators and air stones. Air stones don't aerate the water directly. The act of the bubbles breaking the water surface, hence surface tension, causes oxygen exchange. As you said, air stones also degass the CO2. All I do is have the outlet of my canister 1 inch below the surface and blowing horizontally across the water. This creates small ripples which again break the surface tension and aerates the water. I have 30 cardinal tetras, 10 lemon tetras, 100+ RCSs, 10 Caridina Typus and hundres of pond and ramshorn snails all in a 165L tank with CO2 at 2BPS fully dissolved with a massive external CO2 reactor and have no issues with fish gasping for air. Here is a photo of the famous Tom Barr's tank with the surface ripples for oxgenation.

Isn't an apple snail the same as a mystery snail ?