You are asking a valid question when looking at snakes in general.
But for BP's I suggest not to use the CHE, why? Because BP's are supposed to heat up their body using the heat from the substrate and not from the complete environment.
Also there is a risk of your snake getting burnt when the CHE is unprotected by some sort of cage construction. And your substrate will dry out quickly so humidity will be a pain in the a*** to keep it on the correct level. And (just guessing here) I think you are using a glass enclosure, so this will be a challenge on it's own to keep the humidity on target.
I don't know how large the enclosure will be, but if large enough (31.5in and more) I would recommend to divide it in to 4 sections. On each of the 3 sections put a UTH on a slightly different temperature (from high to low or the other way around lol) and leave the outer section which is closest to the UTH with the lowest temp without any UTH, this way your BP can find the temperature needed at that time.
If you do decide to use the CHE please have some form of protection around it so your BP will not get in direct contact with it.
And yes it can cause high temperatures when not adjusted properly, so use a dimmer so you can adjust it to the temperature provided by your UTH.
P.s. Day and night bulbs will give you heat on a spot, not the whole enclosure.
And as you are using a UTH for the hotspot, this will not provide you what you want.
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