I am quite sure that rb133c does not have license capabilities to run as AP. Rb133c is designed for client scenario . rb133 does support AP. It can’t handle a lot of load, and lacks memory resources. It may work fine with a handful of clients though. Does this help you?
HotSpot does not sound like solution for CPE.
RB133c is CPE board.
There is option in ‘ip hotspot profile’,
http-proxy (IP address; default: 0.0.0.0) - the address of the proxy server the HotSpot service will use as a proxy server for all those requests intercepted by Universal Proxy system and not defined in the /ip proxy direct list. If not specified, the address defined in parent-proxy parameter of /ip proxy. If that is absent too, the request will be resolved by the local proxy