2 slide toppers on one large slide

We are picking up a new Keystone Outback 323BH this Friday. The TT has a huge 19' slide that is 36" deep. We have always had slide toppers but the unit does not have one. Due to the size they probably don't make one.

I was wondering if I could add 2 10' slide toppers on instead. Granted there would be a small gap where some rain will get through but II prefer them to help insulate as well as keep debris off the top of the slide. Tks