How Many Cameras...

Hi, I have 2 access doors that I wish to fit with video doorbells. My question is how many Video Doorbell 2K (Battery-Powered) cameras can I link to a single Homebase 2 unit?
Can I link 2 doorbell cameras to one Homebase unit or do I need a Homebase unit for each Video Doorbell 2K (Battery-Powered)?
Thank you.