The better method will be installing an android emulator as those are easier than setting up a virtual machine. There are tutorials on YouTube. But again the added complexity comes from having to buy IP addresses and assigning that to each virtual emulator instance. If you want to skip past that and want things to be very easy, just go with renting a VPS for 20$ to 30$ from contabo:
https://contabo.com/en/vps/
Yea this is important information to keep in mind even if running shorts channels, as many shorts channels face random deaths or decline in impressions.
aren't android emulators detected as something spammy by google?
also about your cycling method, what happens if you run out adsense+contaboo vps (for which you are paying for each instance)+phone combo and still not rank?
what i mean is, you run your 10 videos on channel A: no success, video number 10 is uploaded and unfortunately still no algorithm recommending you, stuck. this action has effectively consumed an adsense+contavo vps IP+phone number combo, you cannot use this again for the next channel since they would see you are reuploading the same videos
and so you try channel B, same thing, channel C, same thing, channel D, same thing
at some point you just run out of resources, and you cannot start the cycle again at least with the same videos
what if you cycle through all of your resources and get no luck?
another problem I see with this method: what if someone steals your videos and strikes your channel? they may steal them and reupload them before you do again, meaning that they own the oldest record of the video now, which would allow them to strike