I do not think this will be a prob for you chickrick. As others have stated, an egg that is deemed unhatchable (soft shell etc) is eaten and eliminated. if it falls or breaks it will be eaten. If it freezes before you get there to collect, it will be eaten. Its not a egg-eating problem at all. Its chickens cleaning up.
things to consider are having enough nest boxes for the layers, if they fight over the nest holes, eggs will be broken in the fight. Are they getting enough calcium? If their egg shells are hard then yes, they are. An occasional eaten egg is clean up. Several eggs eaten a day is a problem. My flock eats an egg maybe once a month. I dont have egg eaters. I have an efficient clean-up crew.
Sometimes an "assortment" is not always a good idea. If you have 20 breeds of chicken, small, big, aggressive, docile, broody, not broody....this could be an issue for you. Maybe not now but later down the line. Some hatcheries sell straight run of late bloomers. Its the few eggs in the incu that didnt hatch the same day the rest of the eggs did, but still hatched a day or 2 later. While they are offered at a lower price, sometimes you wind up with 20 chicks of 18 breeds and completely different temperment and habits. and thats not ususally good. It could be a way to get some rare breeds and fancy ornamental birds though at a discounted price. You roll the dice when you do that tho. You may wind up with RIRs, plymoth rocks and leghorns