Is there an advantage(s) of installing both the SL2Vi from Vaistech and an Ultimate Lockpick1 from Coastal Tech?

What I want to be able to do are the following and have them controlled through the Nav:
- use my Ipod for music
- use my Ipod for video viewing on my nav screen
- in the future, add/install an external DVD player and additional monitors
in the front seat headrests
- bypass/override the limitations of the nav and other stuff (bluetooth, etc...)

I know that either one of the above products allows some of the capabilities, and at the same time overlap (i.e. provide the same capabilities). But, neither one of them has all. So, I guess the question is not only what are the advantages (like can both be installed to take advantage of the total features), or is there an issue with installing both?

Any insight you may have based on either experience or evaluation or investigation, would be greatly appreciated. I purchased the SL2Vi during the recent GB and before having it installed, have been thinking that I also should get the Lockpick and have them installed at the same time if having both makes sense.

Thanks in advance for any responses.