Fitting an Ikea Kitchen

Going to fit a Ikea kitchen in the next few weeks for my daughter. I've just realised that the cabinets fit flush to the back wall on a rail, and there is no gap for the service pipes at the back of the cabinets.

Question: Do you just notch the cabinets at the back to allow for services, not ideal I know, but whats my options. All suggestions welcome please.

Thanks in advance