Permanent monitor mounted inside door

My first-edition doorbell has finally bitten the dust. I need to replace it. and I'm thinking Pro 2, but I would welcome advice on which model to use. Additionally, I want to mount a monitor on the wall inside the house near the door that I can use for both audio and video., instead of using my phone. Any suggestions on the best device I should use for the monitor? Preferably one that I can click on and have zero or very little latency. Thanks in advance for any help.