Triple suited hands can be very powerful in certain situations, and can often play similarly to rainbow hands in terms of preflop hand selection. However, the exact strategy you should use will depend on a number of factors, including the HEB Partner specific triple suited hand you hold, your position, and the actions of your opponents.
As a general rule, you should always consider the strength of your high card holdings, your connectivity, and the strength of your suits when deciding whether or not to play a triple suited hand. For example, a hand like AQJ9 triple suited to the Ace is a very strong hand with good high card value, strong connectivity, and three suits, so it would typically be a hand you would want to play in late position for a raise.

Do not play them unless you want to steal from late position. The third suit hurts your ability to hit flush(-draws) significantly. Those hands are nearly treated as rainbow versions from a GTO perspective.