For what it's worth, a picture of my "bench" is attached below. For perspective, I assume this is at the bottom end of the scale of bench sizes you will find among forum members.
In fact, my whole bench
is a shelf: one of my trusty Ivar bookshelves from IKEA into which I installed two 60 cm deep boards as a desktop.
The shelf with the power supplies, scope and frequency generator sits 40 cm above the desk. That's a height which gives me good visibility of the desk, and also puts the equipment on the shelf at a comfortable height (easy to reach and see). I also get bright and glare-free lighting from an LED strip attached below that shelf.
As you can see, the bench was meant to be twice as wide, but the left half has been taken over by old arcade and computer stuff for now. I might reclaim it as a bench if I get more serious about electronics... Not shown is the large (!) cupboard full of materials, old projects, working and non-working equipment, more old computers, radio stuff, etc.. Electronics and adjacent hobbies have a tendency to eat up space over time...
Regarding your question about CAT1 cables: "Extra-low voltage", i.e. voltage which is considered safe to the touch under all circumstances, is typically specified as < 50V AC or < 120V DC. So the 30V output of your power supply (or even +- 30V if you combine two supplies into a dual supply) is still very safely within that range.
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