If I were faced with this, I think I'd try to come up with something like a thick traction tire and fill that groove to give myself a large enough flat space. I did one similar to that, but I think it had a bit more flat space to put the tape. Note that the tape doesn't need to be very wide, the actual sensing area is very small, so even that little surface should be sufficient if you get everything aligned correctly.
Fill this space with the traction tire.
