I am going to give some advise here that I have participated in, seen work, and is not far from many organizations.
First, I am assuming you have a ready room where magazines will be loaded and other preparations will take place;
Second, Do the shooting tables/benches have a lower shelf;
Third, Are the participants known and educated on the rules, and do they attend the safety briefing?
In the ready room firearms are prepped and bagged or cased, magazines are prepped and bagged or cased, and safety equipment is prepped;
Upon command to move to the range, shooters move to the tables/benches, targets are hung; firearms, magazines, spare ammunition, and other gear is set up for the round, and bags/cases are placed on lower shelf; standard NRA commands are used for the course of fire; at the end of the course of fire, firearms are made safe and targets changed, or firearms are made safe, all equipment and gear bagged or cased, and targets are retrieved; and the line change is then made.
Unless your local range, legal jurisdiction, or insurance vendor demands, do not over regulate and inspect. If a shooter cannot be trusted to follow basic firearm safety procedures as outlined by the NRA and their competition rules, no level of individual inspection and separation of steps will protect you from them.