If i did a run of both grim dawn and titan quest back to back would i be able to get a place to submit that run?

Ask in the games forum

@heathen most likely not. The two games are not in a series, so it's not likely that a multi-game or cross-game board will be added to the site. That being said, you can do a multi game run for fun, but you'll have to submit the two runs separately.