I am about to buy some erc20 tokens, but the purchase would be a couple of hundreds USD each
To minimize gas costs, which will become a burden, plus the advantages of buying ERC20 coins that you can still find on the stock exchange, then you better buy them there. because you have to be able to calculate the amount of profitable that is proportional rather than insisting on having a fee with several different ERC20 coin transactions. because if I were you, the alternative was to only hold the ERC20 coin, then I would think twice.
reconsider.