For now, it's impossible to have a grid with a few html5 videos that would allow having more than one video linked to the same page. Another solution would be if you could have more than one thumbnail image/video for each project.
I saw a request like this in the previous topics on this forum. Some suggested using stack but this option works only for images, some others suggested inserting a custom HTML, which isn't an option if you are making a website for a client.
thanks for considering