I've been playing with the ESP32 and have a small project that I would like to take off the breadboard and house permanently on a PBC and keep safe in a nice enclosure.
You will probably end up making your own enclosure like larryd posted. It is very unlikely you will find something specificly for your needs and if you do it probably expensive.
For quick and dirty housings i use cheap "tupperware" boxes to be found in all difrent sizes. I take a piece of triplex, drill some holes, use cableties/ty wraps to hold my circuit board/s in place and i hotglue the ahole thing in place inside the box.
If after 2 months everything is still going i usualy make a more decent wooden box out of triplex.
You can buy stripboard or perfboard sheets in a variety of sizes. They're reasonably easy to cut with a hacksaw to any dimensions you need, and very easy to drill mounting holes. Those will be a lot more versatile than the breadboard style board you're looking at.
So buy an enclosure that is a suitable size for your project, then cut and drill the stripboard/perfboard to work with your enclosure.
aliexpress or ebay
find an enclosure,
then e-bay had single sided paper based PCB like you posted only many sizes.
paper is much easier to cut, single sided is a PITA
There are double sided fiberglass boards. as well.
Jremington offered the best solution.
make your own PCB, then get those boards made with holes to match the enclsoure of your choice.