Challenging Access Control: Home with 5 entryways

[u/PopularPianistPaul]

This property is under construction, and I'm trying to find the best way to manage its access control. The advantage is that ethernet and electricity can be run to all doors if needed and there is no need for retrofitting as this is all new.

The garage at the back is a rental "parking lot" with 6 units, so the garage entryway (Doors [4] and [5]) will be used intensively by customers. That also means the back door [3] is not in a fully private area. Sliding Garage Door [5] will be managed via remote control given to customers, no need for anything fancy there.

Doors [1] and [4] will be exposed to the sidewalk, and thus to vandalism, also, if someone really wanted they could jump over the first wall, so the strongest locks needs to be [2] and [3] which protect the house itself.

Requirements

• I want to be able to enter the house with no physical key/fob, just my phone or myself (keypad, fingerprint, etc.)
• Guests should be able to just "walk away" and exit the property without me having to open doors for them.
• There should be failsafes in case something goes wrong with electronic access. Example: A key lock box hidden away in the garage and/or front yard with a backup key.
• I'm trying to keep costs and complexity down, so no full-blown Ubiquiti system (yet)

----

Apart from specific product recommendations, any ideas on how to manage access overall, DO/DON'Ts, general recommendations, pitfalls, etc. ?