We have it hidden in the letterbox. The mobile app has a Bluetooth beacon setting where you can have it report either specified beacons to HA, or all of them and you can filter for the ones you want at that end.

The automation looks for the beacon to be reported from either of 2 devices and then switches the lights on, quite basic.

We have a separate automation that turns the scanning for beacons setting in the phone app on at dusk and off at 3am. And another that turns the garden lights off after 10 min triggered by them being switched on

description: ""
mode: single
triggers:
  - value_template: >-
      {{ state_attr('sensor.phone1_beacon_monitor',
      'b5b182c7-eab1-4988-aa99-bd9_1_2') != None  }}
    trigger: template
  - value_template: >-
      {{ state_attr('sensor.phone2_beacon_monitor',
      'b5b182c7-eab1-4988-aa99-bd9_1_2') != None  }}
    trigger: template
conditions: []
actions:
  - data: {}
    target:
      entity_id:
        - switch.garden_lights
        - switch.deck_light_table
        - switch.deck_light_bbq
    action: switch.turn_on
  - event: beaconDetected
    event_data: {}
  - if:
      - condition: numeric_state
        entity_id: zone.home
        below: 1
    then:
      - data: {}
        target:
          device_id:
            - b5c12ce8343fda7810b69c24f
            - a71515f86d7d34ef570acbe8
        action: light.turn_on