In our household we have a tendency to leave laptops lying around the living room. It occurred to me, as L began rolling and trying really hard to crawl (he is currently managing whole millimetres at a time, often backwards), that this might not be a good long-term strategy.
So I consulted the rest of the household (the dog wasn't that helpful), did some sketches, dug around in the piles of miscellaneous wood in the garage, and spent last Sunday afternoon making this between bouts of feeding L:
We have three laptops and a couple of tablets, so 4 slots seemed like plenty, with a box at the end for power cables. The original design was altered a bit when I established what wood I had readily available, but I think for the better (I was a bit too generous with the original sizing).
The short ends are a couple of bits of 3/4" pine shelf offcut; the long sides and the dividers are plywood left over from a flooring project. The other ends of the dividers are held by a 1" batten, because I didn't have another piece of the 3/4" pine:
To cut the slots for the dividers, really I could have done with a router, or failing that, a chisel which hadn't been wrecked by being used to prise up carpet nails. I also realised afterwards that a hacksaw would have been a better tool than a regular saw. All in all, then, they're not the neatest ever, but they do the job:
I'll probably paint it sometime soon (we have some nice grey linseed wood paint left over from the same flooring project as the plywood) but the natural wood looks OK for now. And it's doing the job, for the total investment of a dozen screws and an afternoon with the power tools and a manky chisel.
 After chatting to my Dad later, I will be getting a router next time I'm at B&Q. He says he's spent 30 years repeatedly thinking that a router would be useful but not quite worth it for any given project...