Just installed the rear speakers from Crutchfield but in removing the old pair I noticed they had been mounted with a sealant, I presume to help hold them in place due to them being mounted overhead. There are four screws to hold the speakers but I'm now wondering if it might be a good idea to remove the new ones and apply some black RV sealant to prevent strain on the screws. I read all the comments on replacing speakers and so far I'm very happy with the product but did not see anything about defying gravity when mounting the rears. Thoughts appreciated.