I too love to daisy chain plug expanders. If I can somehow hide them behind a wooden panel, and maybe place them over a heat source, that would be my favorite.

In seriousness, if you checked that none of these thing draw large amounts of power, and arrange those that draw the most power closest (as in least plug hops) to the mains, your probably fine. If everything is under 100W each its probably fine

This looks like it’s in Europe where 240 VAC is the norm. This means a lot of power without a lot of current, this means it’s much safer from overheating. Schuko plugs also have a lot of contact area, making the contact resistance very low. On top of that everything is double insulated with heat resistant plastic.

You can easily daisy chain 10 outlets and still pull thousands of watts without any issue. Not recommended, but still possible. The kinds of plugs used are either direct lighting cords (the flatter two prong kind) or small AC-DC adapter plugs (usually providing less than 25W), probably for lighting.

It might look a bit sketchy, but it really isn’t any issue at all.