Guetting progression ...

This is for numbers ...
First you bet 1 unit and if you win twice you make a higher bet that is 1,5 for next level ...
But if minimum bet is 2 Euro you can not divide and do that ...

Lets assume i play even money bets using high and low.
Then i can put one minimum bet of 10 Euro on high and cover the high lines with three 2 Euro bets and getting a bet that is 1.6 units ...
So with even money bets you can play the original Guetting Progression ...

So my question is how you do it with numbers.
Do i start with higher unit value, like 2 units as one unit bet and where 3 units become 1.5 and 4 units a 2 unit bet and 6 a 4 unit bet ...

Cheers