You have front wheel drive?
All wheel drive?
1/16" depth is the tread wear limit. Confirm it yourself with a penny using the top of Lincoln's head.
Vehicle dynamics is very messy but generally braking force is distributed something like 60 % for the front and 40 % for the back but an e-mail response from your vehicle manuf. advising you on this issue has to hold some credibility. They and the tire manufacturers will be the defendants.
Searching for patents on tires may give you some straight talk as to intended placement.