The last one like that, I tried the white plastic stacking rings.
And then after that leaked for a while, we went back, and cut out the flange entirely, bringing it above the floor by a bit.
I"m not a big fan of the stacking lifts.
Is this on a radiant floor?
For you plumbers out there. I would have been better off, just stopping and insisting that the homeowner needed additional plumbing work.
If you need to do that much additional work, you should get paid for it.