Nope, just those 2 channels will not be enough for you to receive payments. No matter how many shards will take a MPP payment (if the payer knows how to do it), it will end / struggle into your total inbound capacity.

You will need at least one channel with at least 115% of the total price of 1 item. If you want to sell one item per payment. If you want to sell multiple items at once, you will need to have at least 1 channel covering the whole payment.

You will also have to drain those channels every time you receive a payment. So the best way is to buy an inbound channel that can cover at least 10 items. If that is not enough then open another one, even bigger and drain them all the time, end of the day, using swaps.

Read more about LN node liquidity here: https://darth-coin.github.io/nodes/managing-lightning-node-liquidity-en.html https://darth-coin.github.io/nodes/lightning-submarine-swaps-en.html

I will suggest to make small steps, opening a 2M sats inbound channel and if you see that is getting traction and receive a lot of payments, then open a next one, 5x bigger.

Nevertheless, when you can make a payment using 2-3 different channels, using MPP (multi-part payment).