Is it possible to use BLE to give an accurate RTLS that is cost effective

Question

I apologise for the simplicity of this but I am trying to understand if I can create a virtual perimeter (geofence) and when a BLE beacon crosses this perimeter a signal is sent to an app with an accuracy of <1meter. The hardware of AOA and AOD are both prohibitive in cost. I am hoping there is a clever RSSI workaround. I am wanting the perimeter to be adjustable ie a circle with a 10m radius or a rectangle 10mx15m…. You get the idea. Thanks in advance I hope