We do not provide support for hacks, so use them at your own risk. If you're not comfortable with coding, we recommend against using this workaround.
Since you cannot technically hover over the elements on mobile devices (you can only click on them) there will be no hover effect.
Alternatively, you can always show your project title and type under your thumbnails only on mobile devices. To do this, enable your title and type in "Portfolio Grid" settings (make sure to set the "Position" to "Bellow Image..."), then add the following CSS in "Customize" > "Advanced" > "Custom CSS":
@media screen and (min-width: 769px) {
#content-holder .masonry .post-title {
display: none !important;
}
}