I have a similar 9000 pound tall wide four post lift. I also have a two post lift. I would take the two post lift over the four post by a wide margin. The ramps on the four post are quite wide and always seem to get in the way. It is also slower to raise. I use the four post to measure driveshaft lengths and driveline angles etc and also to do oil changes. Everything else is done on the two post lift.
Your builder should be able to share the slab drawings to locate the cables. If not they are easy to locate if you look for the grout plugs on the side of the slab.
Don
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