Ever heard of a player called Boku87 ?
Well they play on Pokerstars & grind 50 tables at a time 
He done 2 challenges (without a tracker)
1st one was to turn $5 into $10,000 in a month !
nobody thought he could do it,even Pokerstars team,so he started a betting book on it and pokerstars even bet against him doing it + many other people.
He did it and made even more money than the initial $10,000 on the book alone
2nd challenge was to turn $0 into $100,000 in a year
No one would bet against him doing it (lol)
i wonder why !
I would post the link to his blog but it's against forum rules
Just google it / or go to pokerstars webpage and search
As for trackers i dont use one and do just fine
If you are going to grind the basic SSS then you dont need a tracker,just memorise the strategy and then you can grind as many tables as you like with the basic SSS because it is a very simple strategy.
All you have to do is make sure you stick to it 100% and dont get tired
(hence the operative word GRIND)
As for what limit can you go to with basic SSS is ????? due to the higher the stake,the better the players become and a good player will exploit you in a nano second, especially if you are multitabling and dont hide yourself from the search feature some sites have.
Because if they search you they can see how many tables you are playing + they probably know the SSS.
I would advise to stick to the micro limits and just play basic SSS.
There is one more option (HOWEVER) you must be very carefull with this suggestion and that is use full SSS (IF YOU ARE COMFORTABLE WITH THIS)
then you can multitable with this, but dont multitable too many due to you will not be able to observe the players at each table so much and therefore,you can not take notes on them which you need to do if you dont have a tracker.
it is risky due to the deviation from the basic SSS and you will without a doubt get into some tricky situations
So to summarise trackers just like anything in life have both pro's and cons,
it is all about what you really wish to achieve by doing this !
It should all be about your poker playing abilitys progression and if you do the second suggestion then you can not really progress your game / only maybe you bankroll.
Hope it works out for you ♠_biggrin: