Growing multiple strains in the same room is totall ok, and a lot of people including myself do it. They would be more work for you than if you were just growing one strain, because each strain reacts differently to environmental factors, so you wouldn't be able to standardize things as easily. Like, you might not be able to fertilize all the plants the same amount at the same time, cause there might be some plants that need more and others that need less nutes. Also, you might want to do some research about your strains and find out things like what climates they grow the best in. Cause if you have two strains that have huge differences in that area, one of them will probably end up suffering. That's all I can think of for now, but really, I think growing multiple strains at once will be totally fine, and way more fun than just growing one at a time.