Hi,
Here is my plan:
1: grab as much sweepstack offers as I can. In a same geo.
2: start a new campaign in
example:
offer1: payout $2.5
offer2: payout $3
offer3: payout $2
offer4: payout $2.5
So I will send 25% traffic to offer1, 30% to offer2, 20% to offer3 and 25% traffic to offer4. My daily budget will be 3th of the sum of payouts of these 4 offers, it will be: (2.5 + 3 + 2 + 2.5) * 3 = $30
My purpose is find the best converting offer. Without lander. So I can test much faster.
My question is:
is this a good idea? If I skip the lander, is the result still trustful?
You will probably get some conversions, but in overall the result may be very poor.
I would put int that extra hour or two to add 2 or 3 landers and raise a budget.
You will have to introduce them a later point anyway, so not sure if your testing would be faster.
Mostly just in different order 
Most of mobile offers (especially subscriptions) doesn't do good job in selling you the offer (just my opinion).
What instead makes more sense is the flow of the offer:
Imagine an offer pops on your phone and you need to fill in your number, then wait for SMS and reply to it.
Then there is another offer that pops on you and all you have to do is to click to download some funny video or game.
In which case its more likely for user (who is not prepared to see the offer with an LP) to convert?