No need to do both as it’s pretty redundant. Pick whatever one you think will work better for you.
Definitely warm up. You’re not looking for a competition PR with your TM test so whatever your normal warm up in your routine is probably your best bet.
Shoot for 1 per day if you can as you’ll have the best performance. You might be able to combine a couple (for example, I don’t think my squat or dead would suffer if I tested my press prior) but you must be smart about it. Doing them all in one day would not be advisable, but again, it’s up to you.