Azure VNet to UDR Redundant Routing

Hi Guys,

Just wanted to get some feedback on what's the best way to setup redundant routing on a UDR in Azure. We currently have 8 or so VNets that are pointing to 1 of the 2 FortiGateVMs(currently have redundant ExpressRoutes connecting to 2 Fortigates).

So my question is - is there a way to setup redundant routes in a UDR for the same destination network but just with a higher Administrative Distance for the duplicate route? - If that's not how you would approach it, does anyone know what the recommended approach would be to solve this issue in Azure.

Our concerns are just around the possibility of the primary FortiGate going down and clients losing all access to the servers that sit behind that FortiGate.

Thanks