whats the best place to get multicam cerakote done on a rifle in either Missouri or Tennessee?

Go to your hometown/state forum, maybe a fellow member can suggest someone local.

Black Dawn Armory in Sedalia did  pistol for me a few years ago with good results. Only one color though.

I know the owners of True Arms LLC in Lincoln, MO. I haven't seen their work in person, but they are good people and their photos look good. I don't know if they do multicam, but I know they do kryptek.

It would definitely be worth your time to check out Blown Deadline Customs. He's in Detroit.

If you don't want to ship try Jeff Forbush @ 4Bush Weapons Refinishing Systems. I think he's in Bonne Terre.

Black Sheep Arms does the best in my opinion followed by Blown Deadline.  They would be the only ones I would consider for multicam, look at Black Sheep Arms stuff and look at Blown Deadlines, you probably will come to the same conclusion as I did!  Your not going to find some local that specializes in such badassery either, look abroad, you most certainly wont be disappointed with above mentioned but you might regret having someone doing multicam that has never done it before, experience pays off hugely in this area.