Can I use Under the Tank Heater (UTH) on a wire shelf?

[JPNLKT]

So, I'm planning on getting my first snake. Haven't decided on what kind yet, probably either a ball python, milk, or corn snake. Either way, I'm planning on buying the Zoo Med Snake starter kit, which comes with a Under the tank heater, and heat lamp.

But my bedroom is tiiiiiny. only 10" x 10", with awkwardly placed doors, and closets, and I already have a craft table in there. So, I'm looking to getting a shelving unit, so I can make use of the vertical space to store other junk above or below the snake tank on separate shelves. Problem with this though, is that I really only have about 45 inches of room for a shelving unit. So a 48L x 18D x 72H is too long to fit the space. There are 36L x 18D x 72H shelves too, but when I upgrade to a 40 gallon tank, it wont fit, because of the bars / poles.

So I'm planning on getting one that is 42" long x 18" deep x 72" high. I originally wanted one with flat wood shelves, like this one: THIS

But I can't find one that is between 40" to 42" Long. only 36" or 48"

But I did find a shelving unit by Honey Can Do that is 42"L x 18D. But it has completely wired shelves. THIS

I've been trying to research it myself, but I can't find anything on this particular topic. I just wanna know, will a UTH heater work fine on a wire shelf, or will all the heat escape through the bottom of the shelf and so won't effectively heat up the terrarium? Is there any other issues regarding UTH use on wire shelves?

Thank you


Edit: Forgot to mention, I'm going to get a 20L tank first for the snake, but if I get a ball python, I will eventually upgrade to a 40 Gallon tank, which is why I want a shelf that can fit one.