On 30 May 2020 14:51:11 +0100 (BST), Theo wrote:

https://www.amazon.co.uk/DSLRKIT-Act...t-IEEE802-3at/
dp/B01H37XNHE

Reviews suggest that it's only capable for 12 W rather than the
claimd 24 W...

and if you don't have a proper PoE injector you can just plug in the
router's PSU via a passive PoE injector/splitter:

I'd avoid passive PoE. When chasing down a fault or patching issue
it's far to easy to put something on the end of the live cable that
objects and lets the magic smoke out.

--
Cheers
Dave.