I'd never trust multiple datacenters on one site. If they're not at least a mile from each other, I treat them as one datacenter. OVH has 4 locations in France

I'd never trust multiple datacenters on one site. If they're not at least a mile from each other, I treat them as one datacenter. OVH has 4 locations in France alone, there's no reason not to use different cities instead of just SBG1+2.