You do not rent a single game server but a resource pool. In it you create several servers as containers and split RAM and CPU as needed.
You can create more servers than fit into the pool at the same time. You can start as many as fit into the RAM and CPU budget together.
Every server keeps its storage even when stopped. Backups also count towards the pool storage.
Own ports, own console, own backups – and you can redistribute resources at any time.
Minecraft (4 GB) and Valheim (4 GB) run at the same time. An additional Project Zomboid server (4 GB) starts as soon as one of them is stopped.