What are your thoughts on these coins for a long-term spot hold?
Why not Doge? if you are for utility and real world use case, Dogecoin beats them all. Thus, most of them have already made an ATH and this is hard for coins that have reached certain highs in the past, they're unlikely to get back to that spot even as Dogecoin is struggling but it's half way there.
Are there any red flags I should be aware of, or do you see potential in one of them?
It's hard to say because all of them are top meme coins and the potential really differs each of us. I can say that all of them have the potential but I don't like how it went for the past cycle and I am looking for profits. The profit that can be tremendous as if I've won the lottery and that's just me and it's different on your case so determine your goal.