I personally would go with something like:
0) In chapter 7, it was found that PV installers interact rarely with geographic data within their assessment and even less often with 3D geographic data.
Or possibly:
1) In chapter 7, it was found that PV installers do not interact frequently with geographic data within their assessment nor obviously with 3D geographic data.
But maybe it is more common in math to say that things are obvious. Maybe if you want to test your readers' Latin:
2) In chapter 7, it was found that PV installers do not interact frequently with geographic data within their assessment nor, a fortiori, with 3D geographic data.
(I actually kind of like this one.) I think, if you are trying to be careful and precise, it isn't exactly clear how some fact can be truer than another. I also think there is some structural confusion from negating interact, but if you really want the original kind of structure:
3) In chapter 7, it was found that PV installers do not interact frequently with geographic data within their assessment and even less so with 3D geographic data.
But I think it would be better as:
4) In chapter 7, it was found that PV installers interact infrequently with geographic data within their assessment and even less with 3D geographic data.
P.S. I always say and write nevermind as a single word.