I use paper bags from the grocery store.
Would not wrap in foil, you are braising at that point.
Wrap if the bark gets too dark, otherwise, let 'er rip.
I have cooked several and never wrapped... They were great.. I have cooked several and after reaching the desired color .. Put in a foil pan an covered... But vented !!!! Pulled when probe tender....
This! It kind of depends on your cooker. If you go nekkid the whole cook you may have to flip it if the bark gets too dark unless you like crispy bark.