If you can get your tripod fairly level, there is a relatively new option of a leveling base. The RRS TA-3 can support 25 lbs and tilts 30 degrees in all directions. It will not give you a 90-degree tilt, but my 4x5 can switch orientation and I have an L bracket for some of my MF cameras.
https://www.bhphotovideo.com/c/produ....html/overview
Unfortunately, it only works with an RSS tripod like the RRS TVC-33 but I imagine there are other alternatives from other manufacturers that are cheaper.
https://www.bhphotovideo.com/c/produ..._series_3.html
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