Sudo RTS Game

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I am starting to work on a sudo Real time strategy game. By sudo I mean the player will not actually see or control the battle and the other player who is a real person would not necessarily be involved in the battle it could be more like an NPC that resembles the player. The game will be played through Facebook. This game will likely develop into a full RTS game in the future. So I am not sure if I need to (should) set up an RTS quality backend for this game now or if I can get away something less for now. I have been looking at PUN2 + PlayFab and it looks to me Photon also offers a free 20CCU hosted server but I am still reading about that. My questions is am I looking in the right direction for a backend.