Just a quick note though, I personally would avoid using an under gravel filter in a bowl. To keep the filter working efficiently it has to remain un clogged. Maintenance within such a small bowl is going to be tricky. And if you did have plants, which would certainly be beneficial, then their roots could also interfere.
Personally I would advise a sponge/box filter. (You can make a home made one if you check out the DIY section on here).
And a big clump of stem plants in the middle. Stem plants are good cause you can literally chop off the tops as they start getting too tall. No need to dig them up or try to fiddle around near the substrate level.
Same goes for the filter, you can just lift it out when it starts getting clogged, give it a quick rinse in some old tank water and pop it back in.
I can't see cherry shrimp leaving the tank for any reason to be honest... but to be on the safe side it probably wouldn't cost too much to get a piece of clear perspex cut. Or for that matter you could probably just do something 'home madey' for a lid.
Eg. Old pair of tights , piece of cross stich canvas cut to size, left over lid from large boxes/tubs cut to size (with a couple of holes punched in for gas exchange).
Just have a sit and think what you have to hand... or like I said get something cut from a plastics place.