Can you recommend me hardtail bike which to convert to rear hub motor ebike? Something 700 dollars max new.

Currently I'm thinking about to get one of these used: Cube AIM/Analog models, trek marlin 5, White xc 290, Ghost kato. Any experiences with those or do you have anything else to recommend?

Cube:
https://www.cube.eu/en/2020/bikes/mountainbike/hardtail/aim/cube-aim-blacknred-2020/
https://www.cube.eu/en/2020/bikes/mountainbike/hardtail/analog/cube-analog-blacknflashyellow-2020/
Trek: https://www.trekbikes.com/international/en_IN_TL/bikes/mountain-bikes/cross-country-mountain-bikes/marlin/marlin-5/p/23134/
White: https://whitebikes.com/xc-290-comp-20/b/2432/
Ghost: https://www.ghost-bikes.com/en/bikes/hardtail/bike/kato-universal-29-2021