where in the concrete floor
outside the edge is easy, handyman & plumber to connect to stormwater
center is harder, breaking work, handyman & plumber to connect to stormwater
regardless there is going to be a plumber to tap the drain into the stormwater
mostly a concreter will not need the grate and channel, those are fabricated in concrete
draining an existing floor properly is difficult, there is no fall to the drain, as there is in a floor made for a drain, and a stormwater pipe has to be run to the drain, very difficult if the drain is 20 feet from the wall
what is the source of the water, perhaps there is a simpler diversion
a plumber can do all the work, but its expensive in labour