I am working on a Google Cloud Platform design where we are going to have several Partner Interconnect from multiple MPLS networks which needs to be isolated.
In the following link it is mentioned that a region can have up to 5 Cloud Routers, it is not very clear if there are limits per VPC, project or region wide.
https://cloud.google.com/network-connectivity/router-quotas
We will in fact have more then 10 Cloud Routers, is this supported in the same region and same project but different VPC networks?
You should also consider cloud routers per project quota, and request an increase according to your needs.
Regarding your question, this link let us know that we can create up to five CR in given VPC and region. So the answer is "yes you can but you may need a cloud router per project quota increase".
Hope this helps.
Update: As shown in the image, I was able to create 10 cloud routers, same region, 5 under a VPC.