I am thinking about using these tiles as a weightlifting platform for my garage. Do these tiles connect straight and flat or do they connected uneven or lopsided at all? I would like to make sure there are no uneven spaces or warping.

Our 1-1/4" Fit Rubber Tiles interlock straight and flat. These tiles would only interlock unevenly if the subfloor were majorly uneven. If that were the case, we would recommend fixing the subfloor issues before installing our tiles.