It's important for you to learn that speakers DON'T determine how much power is put into a system.
For instance, if you have a 50W rms amp and your speakers are rated for 10000W rms, you will only get 50W coming out of those speakers.
You're not going to hurt your amps with virtually any speakers except some weird ones I doubt you'd even come across.
That said. I don't think they make a 5x7 TypeX speaker. So you might be looking at some custom plates to fit them in your door.
Anyway, you have 5x7s in your doors and the rear, if you were wondering