HA Proxy load balancer with 2 squid servers in the backend?

[geek]

Hello,

An organization's requirements is caching as they have almost 1000 users. Currently they just have 1 squid server which is crashing all the time, with sluggish browsing speeds.

They have recently purchased 3 new servers and want to set up the following:

HA Proxy (device 1) Squid proxy 1 (device 2) Squid proxy 2 (Device 3)

So I have 2 questions:

1) Can the above scenario be achieved

2) Instead of installing centos + ha proxy + squid and managing them by hand (CLI), Can I use OPNsense instead? I was thinking turn off routing / firewall and just use HA proxy plugin with built-in caching proxy.

Thank you.