Hello Hammer212,
The RELN channel drain series is designed with pry slot grate openings along both sides of the grates allowing ease of removal and can snap back into place. No need of removing any screws which can possibly strip over time. Ensure prior to pouring concrete, grates and attached to the channel drains and are covered by using tape or the RELN concrete protector tape which is the exact width of the channels and leaves no residue.
Please see how to video below of the grate removal: https://youtube.com/shorts/RSPK0Hzj7RY?feature=share