Let us know in the comments which Proton version worked best for you and your specs!
Users have reported success running the original Xbox 360 version of Forza Horizon games via Xenia Canary through Wine/Bottles. forza horizon 3 linux
However, if you have a high-end rig, the game is perfectly playable. The open world of Australia renders beautifully, and with DXVK translating DirectX 11 calls to Vulkan, the stability has improved significantly over the last year. Let us know in the comments which Proton