For your situation, I recommend the Align 3GX.
You can buy them used and they are cheap.
But, before you take delivery or they ship it to you, ask them to upgrade the 3GX software.
This would be a deal killer if they don't / cannot do this.
The 3GX work a whole lot better with the newest code and they work like crap with the old code.
The old BeastX is also a good unit that does not need a PC to set it up.
But, they are a little more expensive than the 3GX
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