Now I see how the misunderstanding came out, I meant "tablet" (or smartphone) power adapter, not "laptop", the latter ones may have multi-voltage negotiation or anyway can output more than 5 V.
These kinds here:
https://www.techly.it/caricatore-alimen ... let-1.html
https://www.dcutec.com/en/usb-chargers- ... 88936.html
These can only provide 5V, so they are "safe".
Thank you very much again tangent for your input on the matter, I would have never thought to get an access point instead of a router.
Yes, I do not need (now) any of the Wi-Fi capabilities right now but if I can have the same (or possibly even better) routing capabilities AND if needed the Wi-Fi, why not?
Thank you very much for the comparison table, it seems that there are no real differences in practice between the two and with the radio on the ax lite disabled it may even need less power, besides the 1 less ethernet interface, the ax-lite seems like more flexible/reusable in the future, and getting them will allow me to experiment/learn about the WI-Fi part.
The fact that it comes already with Ros7 (and with 128 MB storage) should more than compensate in my use case the the misssing USB and SD ports.
As well, I don't think I have an use for zerotier right now, but it is good to have this option should the need arise.
Since my internet connections are very slow anyway, even if the ax lite it may be slightly slower due to slower CPU and less threads (but maybe this is compensated by the different architecture) the ax lite seems really like a more suitable device.