These are a couple of small holders for the hx200q6 power bank available on Amazon 

https://www.amazon.com/Portable-36800mAh-Tri-Outport-External-Compatible/dp/B0936GZ7H3/ref=sr_1_1?dib=eyJ2IjoiMSJ9.oTzvo8C6WUrRVoIPhswqWliCRljs1ZobmO7SfPVtInt49UVNZCfPUNe99smO6zsN.7a5CoyvSbnpKDHZXtlKYUdUIE1n07XCoE4j2GCkXSQc&dib_tag=se&hvadid=635990253963&hvdev=c&hvlocphy=9015676&hvnetw=g&hvqmt=e&hvrand=17500915582194190462&hvtargid=kwd-1441838138607&hydadcr=6891_13207482&keywords=hx200q6&qid=1732236344&sr=8-1&th=1

Mount the power bank with tape or screw holes in the tabbed version.