Technically, yes. But OnClick earns the most when Monetag is the only popunder network on the page. Two popunder scripts on one page compete for the same click: whichever script catches the click first opens its ad, and the other one does not. As a result, your Monetag zone receives fewer impressions than it would alone, and your total Monetag revenue drops.
Want more revenue from the same page? Add other Monetag formats.
Vignette Banner, In-Page Push, and Push Notifications do not compete with Onclick for clicks, so they add revenue on top of it. All of them can be installed at once with a single MultiTag.
If you need any assistance, feel free to contact our support team via e-mail support@monetag.com