If you're really worried about it use a turkey baster to water change if it's a nano under 40g
If its main display u or frag tank over 40g a hose may want to be utilized to siphon detritus, but if you're too fast u will suck the snails.... if u use a filter sock and clamp it to side of bucket and run one end of hose through it it shouldnt be a problem even if u suck them up the filter sock will act as a saftey net
The thing u need to be careful about sucking up is sand and creating a silt storm and releasing anaerobic bacteria in substrate if stirred that's why its important to manually remove detritus
And waste in order to not let waste set and convert to n and p
As pockets will formn dead zones and corners by rocks
But if u have a good clean up crew that agitate the substrate u may find yourself doing this signifigantly less
Just make sure to keep substrate pristine and if detritus becomes a problem ontop of wc I'd say cut back on feeding and a wc 2x compared to 1x a week until problem is solved if one happens
If u have a nem basket or mushroom basket u could put the snails in there temporarily if you're really that worried about it...