mine fits into a 200L plastic drum.

you can bury it into the creek bank to make it less noticeable. really it can go anywhere you can run a 1,5 pipe.
of course you need to build an intake too. a box in a flat part the creek, most people end up pouring concrete eventually.

amperage increases as the vertical drop between the intake and turbine increases

so the most noticeable part is the pipe running from intake to turbine 😬

and in America anyway
you don't want to mess with Fish&Game