Ebay question

Say I have X product to list on eBay with a quantity of 20.
Is it safer to list them all at once or re list for lets say every 5 sold.
I am trying to avoid limitation at all costs, the eBay is quite aged with no limits so hoping I won't ever get asked.
But I don't ever want to get asked for a supplier of the goods as I can't provide such info, so not sure how I should go about listing.

Any help is appreciated.

just dont sell large quantity if price is alot eg over 20 dollars

The items I have are worth more than 20$, I might just set a limit each month to be safe and sell some of the items elsewhere.