Doorbell Installation

Hi, help needed. Moved into a new house and really need a video doorbell but don't know where to mount. I've attached a photo, I don't really want to drill into the UPVC as we're tenants in the house for the next three years. The model is the new 2nd Gen Ring Doorbell just released in June. I read somewhere I can use a double sided outdoor sticking tape, anyone any more specific installation instructions. Ring support say no and I should go for a refund. Another thought I had was to install on the concrete wall which is on a 45 degree angle to the left of the door, but I'd guess folk would press the button and turn and face the door, just wondering how this will make the visitor look like on the camera, ie will they be easily identified still?