@KirkM SFP+ and SFP28 are compatible and will run at 10Gb/s. QSFP+ and QSFP28 are also compatible and will run at 40Gb/s.
You cannot generally connect a QSFP to SFP as the former is really just four channels of the latter, though there some adapters that disable three channels to make a 40Gb port run at 10Gb. I don't know whether these work with Meraki switches and I would be surprised if they then work reliably with a SFP28 port, but it could...
The FS module that is most likely to work is: https://www.fs.com/uk/products/72582.html