Let's assume first that we know blinds are not over-folding, and 3betting vs btn open about 8-10% (or even more), also assume that we are 100bb deep.

In this case, what is good Btn's strategy when folded to Button? Can one justify that Btn should have only raising range but no limping range?
If sb and bb both 3bet 10% ish, then chance of getting 3bet is nearly 20%. I think this situation is similar to Btn vs BB at HUPLO (although sometimes we get 3way) , where Btn are raising wide (90%+) and BB 3bets wide about top 20% range. So some good huplo players are limping decent amount as a Button even if one has a position. Why not in 6max Btn case? Isn't it more dangerous in 6max because sb can call and bb squeeze, or sb 3bet and bb 4bet so that we can't even see a flop?

Let's say we have two following choices (as an example)
1) only raise top 70% of hands
2) raise something like 40% ranges and limp 40-50% ranges, and fold 10% trash.

I am thinking that 2) could be more optimal (more bb/100 winrante).
Any thoughts are appreciated. Also changing numbers in 1) or 2) is totally fine.