Solving these problems is required. The recommended way is to clear the territory, construction, vehicle and container table, so players can start all over without having to worry about these things. If you feel this is unacceptable, you can sort this out manually by adjusting the constructions limits and territory sizes in CfgSettings.
Please be aware that your server will slow down for each construction placed. As a rule of thumb, 7-10k constructions is where the game engine begins to struggle. We have seen servers where certain groups placed more than 2k objects in a single territory. Some servers have almost 30k objects in total.