Ideas. Here are some framing options of my images. More to come, of course.
These frames from @westelm are float frames. They are two sheets of glass framed with brass or nickel silver. Attached by a latch and hinge they come able to hang landscape or portrait. They are available like the ones here or a horizontal triptych or an easel version.
Pre-Stretched canvas comes in many, many sizes. It can be painted by many types of paints. Small magnets back to back hold the image to the canvas. It can be moved into alignment after it has been secured to the canvas. It also can be glued to the canvas but take care to do it evenly so there are no bumps.