I tried something like this with the HN6 but you can't stuff it in that little hole. You may do a RAM mount but it will be outside in view. The HN7 is bigger.
If you are worried re sunshade get the HN7 sun shade and make it a big bigger. Neither the HN6 or HN7 sunshades work in all sun situations so you need to make a small mod to reduce sun glare on the screen.
Actually I found the HN6 back lighting day and night to be slightly better than the HN7, especially the HN6 for day time..
The HN7 also has a few annoying aspects not encountered in the HN6.

