Turbulator Tape Placement Question

I just bought a DG-101. Already I am thinking of ways to improve the
performance. One thought I had was adding winglets but I have
discounted that for now because of the effort involved. Maybe later.

Another thought was turbulator tape. While my opinion (uneducated) is
that this will add to my L/D, the question of placement on the wing
leaves me stumped. Here are some questions;

1) Will it help? Let's get the basic questions out of the way first.
2) Where should it be placed? Would an oil test help in this
analysis?
3) What type of tape is best? I see Wings and Wheels has four types;
two sizes of 60 degree, one size of 90 degree and dimple tape.
4) Any idea of how much this might help? I know that this is the
toughest question of all.

I appreciate any responses.

Thanks, John