Safe to drill?

I’m looking to install this TRX mount to a floor joist in my basement. The bolts would be 1/4 in diameter and extend 3 inches into the 8 inch wide joist. I want to make sure I’m not compromising the integrity of the joist, but when I researched it, I could only find rules of thumb for contractors (who are typically drilling holes through the broad side of the board to run electrical etc). I’m unsure how the rule for 1/3 on that side or the rule for 1/6 for a joist notch would apply in this case. Thanks for any help!