SIP providers usually sell numbers in contiguous series for businesses. For example, if your company buys a block of 50 numbers, the SIP provider then allocates XXX-5100 to XXX-5150.
But since you’re keeping this strictly internal, you don’t have to worry about that.
I don’t see a problem here. If the US auto makers are so worried, they should buy a few of them, copy their secrets, and sell them at a marked down price.
Turnabout is fair play, after all.