Sub with seat covers?

I'm considering adding a sub behind the rear passenger seat in my DC but I don't know if there will be an issue since I have seat covers. I've seen were a lot of people remove the plastic on the back of the seat for clearance....anyone have a sub and seat covers? If so any issues?

 

I've noticed the covers cause some rattle , I think alot of people remove them for that purpose aswell as clearance .

If you have the clearance I would recommend putting some double sided tape or if you have the money some sound deadner there . The plastic touching the metal seat brackets can sound ugly , and they aren't very tight fitting from the factory .