Is it permissible to display products online and appoint marketers for them without owning them, while adding a personal commission and a commission for the marketers, after the merchant's authorization and knowledge of the commissions?

If the owner of the merchandise sets a known commission for you in exchange for selling it, or tells you to sell it for a certain price and whatever exceeds that is yours, then this is permissible. Your seeking assistance from other marketers for promotion and guidance is also permissible.