I’m with you, Seems LONG RANGe and Multiple concurrent connections(8) are two slices missing from the Arduino BLE Pie 
interesting part of it is the position;
from the link…
Holding your test kits in the correct position/direction
The picture below shows the front side of the DK, where you can see the Nordic chip (nRF52840), the matching network (marked with a red box), and the connector for the external antenna. We are not using an external antenna, and just using the PCB antenna that is printed on board. So with this specific PDK, the radio pattern radiates strongest on the front side. It radiates on the backside of the PDK as well, but you will observe a radio signal strength loss of about 3-4 dBm on the backside. This is due to many reasons (material of PDK, underlying printed metal circuit, etc). Therefore, it is best that when you are testing with PDKs, you set them facing each other as shown below. They do not need to be aligned to the same altitude. Facing them each other with any individual altitude should be ok.
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TY
GL PJ