If you have two channels, the approach will depend on your tone goals.
If you don't run effects or any sort of distortion, send the signal from the bass to FOH as early in the signal path as possible. Most likely: Bass -> Wireless -> FOH.
This gives FOH an unprocessed signal to work with, so the audio tech doesn't have to reverse engineer and undo what ever settings you use to get your mojo in your IEM mix. FYI, the optimum setting for mojo must be tailored to location and intended use. In other words, what works for you on stage may be very different than what is required for the house mix. Another advantage of taking the FOH signal off before your processing is it allows you to adjust your level and tone during the show without screwing up all of the other mixes.
The signal for the second channel will be reserved exclusively for your IEM mix. I.E This signal is not used for the house mix so you are free to do anything you want to it. The signal should be take off after your processing. The idea is you have controls at your finger tips that allows you to set your level and dial in your tone.
If you use an active bass, I suggest running the tone controls flat and dialing in your sound with your processing. During the show, if you want to tailor your sound to different songs, you can make minor tone changes using the bass's controls. However, don't get too heavy handed with these adjustments as they will not translate the same across all mixes. Also, if you apply too much boost you may wind up overloading the system and causing really nasty distortion or excessive compression. If aggressive adjustments are required, these should be tested and negotiated during sound check...starting with your line check. This should not be a surprise. Make sure the audio tech knows to expect this before gig day.
If you use effects, the optimum signal flow will be different and there are lots of options that will vary depending on the individual philosophies and goals of the player and audio tech. Optimum signal flow is also impacted by the capabilities and limitations of the gear.
Since there is essentially an endless range of possibilities, your signal path should be discussed and worked out with the audio tech well in advance of gig day.
I highly discourage the idea of waiting till gig day to work things out. IMHO it's actually rude and unprofessional. On gig day, audio techs tend to have a wide variety of critical details to manage. Making sure the system works correctly is top priority, so there is a good chance the audio tech will not have the attention or patience to dedicate significant time to one person's artistic vision or how best to achieve it.
Essentially the audio tech's attitude towards you may reflect:
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