Getting a merchant accounts every 10 days is impossible anyway.
Just the time to do the KYC, the integration, etc will require more time, and then what is happening when you contact all the psps?
Also, psps will require your processing histories as your website is not « new », if you send them statements for the past 3 months and they see 5/6 psps on them..they will reject you
Also, you will have a rolling reserve stuck in so many payment partners that it will start to be critical for your cashflow.
The best is to find a psp/acquirer ready to onboard your « website » and they know what they will onboard.
Or as everyone mentioned, trick the psp but they need to know how to handle chargebacks or you need to have a low rate.
If you do not have a lot of chbs, the psp and acquirer will not check the chb reason code so you will be safe. You have many optimizations to avoid chargebacks for high risk merchants
The best payment setup depends on your business vertical (and on what and how you sell)