If u have around 300RM budget, go get some old pc, 3-4 years of age, intel celeron, core 2 duo, 512mb ram and hdd space enoughinstall pfsense. Oh dun forget to get a dual nic and wireless nic that can turn to AP. Ive configured mine cost less than 350RM all in.

Install pfsense and install those proxy module,such as squid. Pfsense can be a very powerfull tool as a router, firewall, WAF and AP if you configure it right

You dont need to install anything on end client device.