What ArchonOSX says.
However, MWBCs are falling out of favor because of the GFCI or AFCI requirement in so many places. For instance, your garage requires GFCI protection.
Putting GFCI protection on an MWBC is annoying. Puttng it in the service panel requires an expensive 2-pole GFCI - handle-tying regular breakers will not do, because GFCI devices can't share a protected neutral.
You can use GFCI deadface or liveface* modules... But this must happen after a half-circuit splits off permanently. That is to say, hot1 goes east, hot2 goes west, neutral splits, and you can put a GFCI liveface/deadface on each branch after the split, and daisy-chain outlets from there.
If you're installing 2 GFCIs in a single box, make sure it is a deep box. If metal, I recommend to change to either a deep 4" or a deep 4-11/16" square box ** followed by a 2-gang mud ring, not a domed box cover. The 4" domed box covers provide for a neater installation, but you must bend off the mounting-screw ears on a GFCI (or any Decora) device, making it not reusable. If you can change to 4-11/16 boxes, ask the electrical supply if you can see the domed cover, and see if it has clearance for the GFCI ears.
* otherwise known as a GFCI+receptacle combo device.
** those are cheaper at real electrical supply - big-box gouges you on the fat boxes. Also big-box will not have the covers you'll need for the 4-11/16 boxes.