Shorting is a bad f**king idea unless you're a professional stock trader and doing your full due diligence and have a lot of money to burn away if things go south. It might be a fun meme until it really, really isn't. I'd try to find a less risky way to own the cons if I were you.
It's not like I'd be putting in loads of money. Definitely wouldn't do anything higher than $100.
The thing with shorting is it doesn't matter how much you're putting down - your losses are potentially infinite because it involves a promise to buy the stock later at whatever price it might have at the time.
Do I think DJT stocks are gonna go up massively? Probably not, but with the amount of volatility inherent in that kind of "meme stock" I would not risk it.