I saw that 8POE unit. Debated about using it centrally when I got their 8-4POE. Gave a lot of consideration of staying with small units, decentralized setup with three small 8-4POE hubs, short runs to the cameras, then three quick lines back to the main router. Faster install. Would work great.
But. Would still need a bigger switch at the router. If I had an 8 port centrally, I'd have little or no room to grow besides then upgrading to a bigger unit or adding a second small unit, as I'd like to have a few cams up and add two little wifi POE access points (wifi doesn't reach the garage or back deck, eating precious & slow LTE). Decentralized goes counter to the IT ideal of end-to-end direct lines. It is easy to start small and inexpensively, but becomes a bit of a headache of several little boxes everywhere that need power, and ideally a some power conditioning and battery backup. Troubleshooting difficulty if something is wrong. More wires, jacks and connectors that may have a connection issue. If not for me, for a family member in my absence, or a future owner or their technician.
So, the decision was made to go a step bigger. I figured it'd grow from 4 to probably 8 cameras. So, a bigger POE switch with more power and routing capability. I think it can handle 250W total and 30 per port. All direct CAT6 lines. One UPS for the system.
Then shortly after that came the realization / decision to relocate the internet router and switch (+ existing ethernet lines). Installing a network / server rack. Instead of having stuff in two locations. So, it is now a long sweaty dusty road full of crawling and climbing to get there, but worth it. I'm already liking the rack and can see how it'll all come together, one cat6 line and one POE6 line at time.
For POE failure, I probably will keep the small 8+4pOE handy. Or splice in a thin 8 port POE injector strip like somebody showed here.
In the grand scheme of things, considering the cost of the cameras, switch, recording system, wire, all the little doodads that add up, time to install, ... should a single part fail, it is not the end of the world. But, it is good to have a little backup.
Anyway ... time to rerun a few existing lines a bit longer!