Hello,
Many thanks for your question,
We wouldn’t really recommend for patio doors as they’re a naturally heavy product.
Nevertheless, we’d always recommend to install the brackets and follow the instructions we provide.
Have you taken a look at our perfect fit blinds? These may be a better product for patio doors subject to clearance? https://www.blindsbypost.co.uk/perfect-fit-blinds/perfect-fit-venetian-blinds