Just use anything with a flat surface. Kitchen and coffee tables, mantle and fireplace, kitchen and bathroom counters, on top of the washing machine and dryer if they're not top loaders (or maybe even if they are! ), on top of the toilet tank... Too bad they don't make those old giant CRT TVs anymore because you could use that if you have any... Do you have an old NES around (not a Classic, not a top loader), because that could work... Depending on whether or not you still have cable TV (which a lot of people in our generation don't because they rely on streaming services, but w/e) maybe your cable box has a flat surface you could display gundam models on... Depending on what type of computer you have you could display them on the tower/whatever you would call it...