Squid is more for outbound proxy (inside to outside), not inbound (outside to inside). IE. you have 2-1000's of users connecting out, and want to funnel them through an appliance to log what they do.
If you want inbound for web services and such like your 9 websites, better off using nginx or haproxy to do so. Nginx can give your unencrypted 80 access, and present tls-based services if you wanted to (who doesn't want encryption?), even things like quic/http2/3 for faster protocols. HAProxy is more base level tcp redirect function, but less about web services and more at a L4 port decision, accomplishes the same minus TLS termination nginx can/might. People buy appliances like load-balancers to do these sorts of things too.
-mb