There is no correct answer because there are software out there that can spoof your MAC but you must ask yourself, how reliable are they?
As mentioned above the simplest and safest way is to use 1 laptop per account, what you have to ask yourself is how valuable do you see your eBay accounts. If you use eBay as full time then I see no reason why you shouldn't invest £200 - 300 per account and just see it as a business expenses. Then you know this is a SOLID set of account.
If you do eBay part time for this and that, then you just use the software.
Also remember the Stealth Book is just a guide line *very good one* the rest depends on what you sell, value, amount, experience and etc.
Hope this helps :D
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