but in my area, weep holes are the first course above the slab apron. The size of the weep hole is this, its just the mortar gone from the sides of a brick. So, that could be about 1/2 inch wide by 2 inches tall. There should not be any screen or cover over this.
The idea is for water to leave this area between the brick and the inner exterior wall area IF it got in there some way. My weep holes and the ones that I have seen are about 8 to 10 feet apart. Actually pretty far apart to even work properly if really needed.
I would get a 1/2 inch drill and a 1/2 inch drill bit and waller out the mortar on the first course between the bricks and go every 8 feet and be done with it. If you have a hip roof, or even overhangs, the possibility of water getting in there is pretty remote.