Can you mount accessories on the handlebars and still fold the bike?

The handlebars can accommodate any standard accessory.

The handlebars are industry standard diameter.

We cannot determine is the accessory will interfere with folding of your bike. You will have to test this with the actual accessory installed. 

If you are installing a "wired" computer, please allow extra slack in the wire to allow for the stem to be raised and lowered.

If you are mounting a wireless system, you should just be able to mount the computer and sensor(s) and ride!