Rb951ui connected with each other thru poe in poe out

How many RB951 can be connected in serie (one after another) using the POE in and POE out from another rb951.

I want to create a network mesh with 10 of these rb’s, all traffic will travel trhu wire and wireless interface will provide the access to clients.

I was wondering since all RBs will have poe in and poe out, how many can i connect without using the power adapter?