I would be more concerned about the interrupting rating on the duplex breaker. I can't read the label. It might not be suitable as service equipment. There are extra holes, moving the neutrals is easy. To be able to use those empty slots, the panel needs to be mounted sideways.
Not a lot of wiggle room in 240.81
Where circuit breaker handles are operated vertically rather
than rotationally or horizontally, the “up” position of the
handle shall be the “on” position
