PVC and Heat Tape

[Homebody]

While looking for pvc enclosures, I came across Apex Reptiles. I really like the modularity of their enclosures, and given the 6-8 week lead times I intend to order soon. I'm tempted to get a 3x2x2 (instead of straight for 4x2x2) since I could expand it later if necessary, but I think sticking to 2 foot increments will give me better stacking compatibility with other enclosures.

The Apex Reptiles website swears pvc insulates too well for UTH to be safe. From what I've gathered here UTH is necessary, and heat tape is typically used with pvc. Am I correct that the UTH is necessary, and that I should ignore the website's warnings?

I plan to maintain ambient heat with an 80W vivarium electronics radiant heat panel and a pulse-proportional thermostat. Should I put the heat tape on a pulse-proportional thermostat as well, or will the on/off thermostats I'm using in my current setup (for CHE and heat pad) suffice?

I really like the modular design of these enclosures, as well. Very versatile. Snakes change over time. Collections change over time. I imagine it will be a big help to be able to modify an existing enclosure rather than having to purchase a new one.

As for your heat question, I have an 80w VE RHP in a 3x2x2 enclosure and I can reach temps of 95+, but the basking spot is only about a foot from the heat panel. So, if you have trouble reaching basking temps, it's easy enough to elevate the basking spot closer to the RHP. Just use a box or shelf.