Thats ok then you don't have to buy a pump top.
But this way you cant mount the res on the pump.
If i where you i would search for a XSPC res/pump top.
So then you have the option to go for bigger size tubing later on and you will take some length out of the loop.
If you cant find one i would advice to get the pump top and the micro res.
On the left the res/pump top and on the right the res with a separate pump and top.