It is a positive tip 24VDC with a 1A rating. It is nothing special and you could use more than 1A if that is the only thing you can get as the device will only consume what it needs. This is not an uncommon scenario as you are working with DC power and to have them spec a transformer means that they would need to source one for every country where sold where the power grid is different and/or the spade lugs are.
The ideal way is to provide a transformer just as they do with the phones ( I can only speak to the NA market), but then make it a universal switching supply that comes with a swap-in/out set of plug configurations. It would obviously raise the price and I suspect that unlike a phone, more folks use PoE when using the AP so many might pay a premium for it that would go unused. I do not know if they provide a transformer for the phones in the various EMEA and AP markets and the derivatives in each. Maybe they do supply a universal PS with the phones.
While I do not use a transformer, my distributor apparently thought of the need and sourced one that they carry for such use.
Smartnetwork- the transformer you posted may or may not work. I see that you are from the NA market and the picture in the link you posted is not showing US outlet style spade lugs.
You can find these to be readily available on Amazon, Ebay and other outlets just do a search for “24V 1A power supply”. There will be many and you can filter based upon user rating and then read the details to insure positive tip. Here is one such example -
The issue is that these are wall mounted transformers and virtually all made in China, long-term reliability may be a concern, but at the price point, may not be an issue.
If it were me, i would opt for:
My need for a 24V PS in the future is likely not much, but for a PoE+ injector, it is likely to be more so.
In any event good luck.