I don't mind Trippier at LB, but when we have two quality LBs, it is a bit odd.
If Southgate wanted the famous Spurs FB pairing of Walker & Trippier, I'd rather he swapped them round.
Trippier on the right so he can use his excellent delivery.
Walker on the left, because his attacking game is primarily about running fast, then stopping to lay the ball off, which he should be able to do just as well from that flank.
It is odd though that two FBs who were often criticized by Spurs fans are picked of James, Chilwell & Shaw.