There were no mounting holes drilled for the RHP. On the advice of more experienced hobbyists on this site, I install my RHP on the left side of the viv, over the UTH.
I purchased an 80 watt RHP which does a great job of maintaining temps in my home, where I keep the temp around 70 degrees.
I know that the 2'x3'x12" viv comes assembled. I believe that the larger vivs may be shipped unassembled. I think the information is on their website.
You can find some pics of my RHP installation here: https://ball-pythons.net/forums/show...54#post2615854