Here's more ways of holding them in place.(reverting back to my first 'ible using empty adhesive/sealant cartridges)
other plastic cylinders should work e.g. cut top & bottom off a plastic drinks bottle.
Update: "No" for drinks bottles. Plastic seems to be too thin. -but don't let me stop you looking for a suitable one.
These are shown on 2+inch diameter cans, but will fit larger size.
empty adhesive/sealant cartridges
craft knife (may be possible with scissors)
drill (for 2nd version)
cigarette lighter (for 2nd version)
Keep the hand supporting the cartridge well away from direction of cutting knife throughout this instructable!
Hold one end of the spiral against the can while opening the rest of it to bulge away from the can.
Fit the nozzle tube between can and spiral and let it close on the tube.
Step 4: Other Method
At a position where you want a tab to fold out drill a hole small enough to hold the nozzle tube firmly. -best done before the tab shape is cut.
Drill an second hole at a corresponding position at the other end of the cylinder.
I retraced the first cut a number of times so as to not force my way through too quickly(but obviously still slipped a couple of times).
A dremel type hobby tool may make a better cut?
Use some implement(knife, screwdriver) to slightly prise open the tab.
Hold the line to be bent above a cigarette lighter flame to enable easy further bending of the tabs.
Opposite the bent out tabs cut the cylinder open to allow spreading to fit around the can.
Poke the nozzle tube through the holes.
ADDITION; Late realization.(but probably obvious to most) -don't bother with the tabs with holes. Just tuck the spray straw between the plastic and the can. -works, but not a secure as the above methods.