Man, that's really bad luck about technically needing sliders :/
My Sparco sidemounts fit up for the Macht Schnell floor mount just fine without the need for sliders. I'm also only 5'8" like you, so that's probably why I didn't run into a lot of issues. My seat's bolsters are kind of wide though. So the doorcard has a groove in it from seat contact. But door can close fully no problem, without deforming the seat.
I've seen the VAC Motorsport floor mounts in person as well, and thry don't have as many hole positioning options as the Macht Schnell, so at least you got the best off the shelf option there seems to be for our cars lol..
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