use the yellow blocks that come with them that have the disc-centralising forks on one edge.
I spent ages trying to do it by eye, and then with the yellow blocks... but neither could get them exactly right, and I always had a little scuff noise.
One day an advert came up on social media (can't remember if it was FB or Insta - probably targeted and listening to me complaining

) for a thing called "Cycle Pal". It was basically a little piece of thin folded over metal that you placed over your rotor, and then put inside the caliper when tightening the caliper bolts. It was about £15, and I thought "why not".
It worked a treat - fit this, hold the brake lever, then tighten the caliper bolts with it inside. Once the bolts are tight, roll the wheel forward half a turn and remove the 'cycle pal". No rub / squeak again.
I felt a bit foolish when I went back and looked at the comments on their product later, and found I could get exactly the same 'non branded' product for about £3 on ebay... so I bought another for my backpack (on trail tools).
Others have said sticking a credit card on either side of the rotor does the same thing.
A couple more suggestions for getting the most out of MT7's:
- Don't use matchmaker clamps - they'll greatly limit your ergonomics/fit options
- Magura makes multiple different types of levers that can be retrofitted to your master cylinders. Don't be afraid to experiment (1 finger vs 2 finger, different shapes and adjustments, etc)
- Centering the caliper can also be tricky, but is usually best done by eyeball (vs the loosen/squeeze/tighten technique)
I use the matchmaker on my dropper - the AXS 'shifter' has such a big button, that it works fine where the matchmaker puts it... but they were't ideal for my old AXS rocker. I've just ordered a BikeYoke adapter which is supposed to pair up with the Magura matchmaker for holding the POD, so will see how that works out when it arrives from Germany.
My preferred Magura lever was the carbon one. Simple to change too...
I do NOT recommend MT7, for some reasons:
- bleeding is very, very hard
It took me a few shots of bleeding to get them right. They felt great in the workstand, and then went soft on the trail. The bumpy terrain must've helped all the bubbles come loose! On my previous bike, they were rock solid for over 3 years and never needed touched again. I've had them on my current bike for about 10 months now, and haven't needed to bleed them again since the first week or 2.
Just make sure you take the caliper off to bleed it - so you can have the caliper higher than the lever... this may involve having your bike in the workstand in a crazy position (front wheel on the ground and rear pointing right up!!) and gently tap the caliper lots to loosen the bubbles.