If you are just concerned about side-by-side fit and not box capacity, then you can remove the heat sink tabs on the switches to allow for a side-by-side fit.
Inovelli switches do not need the heat sink tabs, so you can remove them as needed. I would only remove the ones needed to fit next to another switch. Sometimes it helps if the tabs grab the side of the box.
Dimmers are a little different. They do make use of the heat sink tabs. Removing tabs will reduce the load capacity of the dimmer. Refer to the manual that came with your dimmer.
