First, uromastyx are sexually mature at around 2-3 years of age. This means that if you have both males and females in the same enclosure, they will eventually start to breed. If you do not want them to breed, you will need to separate them before they reach sexual maturity.
Second, male uromastyx can be territorial, and they may fight with each other if they feel threatened. To avoid this, you will need to provide enough space for them to move around and hide. A good rule of thumb is to provide at least 20 gallons of space for each uromastyx.
Finally, you will need to make sure that the enclosure has plenty of hiding places for the uromastyx. This will help them feel secure and reduce stress.
If you are able to provide the proper environment for your uromastyx, they can live happily together for many years.