So I finally pulled the trigger on the MES40. Sam's Club had an awesome deal. ~$325 for the MES40 gen 2.5 with the legs included. Anyways, I plan on starting the mailbox mod this week and had a question. Where should I drill my duct hole in the mailbox? I've been to almost every thread on this site and some drill the hole in the back of the mailbox and some drill in the top of the mailbox. Is one better than the other? Any suggestions would be greatly appreciated!!