How to tip housekeeping in hotels if leaving tips daily?

I just read a question and answer about tipping housekeeping daily (Should I leave cash tips for housekeeping each day of a multi-day stay?). But how should I physically give them the money? Obviously if I see them I can hand them the money but if I'm out for the day?
I guess I leave cash somewhere obvious, should I leave a note as well? What if it's a non-English speaking country (I'm not sure if you'd be expected to tip there, but maybe you want to). Is there some customary place to leave the tip?
As someone brought up in a generally non-tipping country I often have to work out how to tip, but in general you can just keep an eye on what everyone else does. Not in this case.
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Where do you leave tips for housekeeping?
Make sure the tip is visible, like on the dresser or next to the bathroom sink. Avoid leaving your housekeeping tips on the bed or nightstand, as these areas risk your cash getting jostled around or lost when bed sheets are changed. Nerdy tip: Leave your tip on top of, or next to, a thank you note.Do people leave tips for housekeeping?
The tip doesn't have to be big \u2014 $1 to $5, says the American Hotel and Lodging Association. But fewer than a third of hotel guests leave any money for the housekeepers.How much to tip the hotel maid
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