RF-Mesh for peplink AP

Hi Team,

I would like to get recommendation for following scenario:

An outdoor zone which needs 4 AP, we will use for example 4 models of AP Pro300M
The problem here that we are not sure to ensure wired connection for each AP, is it possible to adopt the RF mesh architecture as following:

AP1 which is connected to wired connection )))) AP2 connected to AP1 via wifi shared by AP1 )))AP3))))AP4

I know that you offer the Device connector which could resolve the problem but in terms of pricing (price is double compared to AP PRO 300 price) it will not be an optimized solution., for that reason I want to check the possibility of the architecture mentioned above.

Other question: there are two alternatives here : each AP will be connected directly to the internet and we manage each AP by Incontrol2 or I add a load balance to manage the totality of APs. Could we explain what are the advantages of adding a load balance compared to the first solution?!

Thanks