As a clinic they don't mind at all but the process can be a pain.
The portal you make requests on will only show Montu stock. So if you're requesting an OOS product or a product they don't stock you'll have to ping them an email instead.
I recommend emailing your script in a day or two before the portal repeat date if you go this route because it takes them 2 days to respond usually.
You can also split your script across multiple pharmacies but you'll need to ping an email for that as well.