There's https://serverfault.com/questions/707586/is-it-possible-to-configure-proxy-setting-through-dhcp, but I have no idea if all client honor it.
Same solution is provided in Set Proxy server automatically for clients.
There's https://serverfault.com/questions/707586/is-it-possible-to-configure-proxy-setting-through-dhcp, but I have no idea if all client honor it.
Same solution is provided in Set Proxy server automatically for clients.