Sure, and I've been there, with dog siblings. I understand the challenges!
For e-collar, I recommend buying Larry Krohn's short booklet "Everything you need to know about E-collar Training". Pretty simple intro to how to properly use the collars, and costs less than $10, so worth getting just to read over and see if that's something you are interested in.
I run multiple dogs off leash and they wear the collars. I hardly ever actually use the collar, aside from the beep recall (very useful in loud areas by creeks or on windy days). But I have them if I need them. The training takes some time and practice, but it goes relatively fast, and is worth it. The collars themselves are fairly pricey, they make two-dog models. Make sure you get a high quality collar.
The training is where you really need to invest time. It's a process, and not easy so you need to make sure you do it right, but you will find it worth it, I think.
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