Allups can be a bit missleading specialy if place betting, look at this for an example.
1st bet $20 winner @ $1.50 return $30
2nd bet $20 winner @ $1.50 Return $30
$40 out $60 in Profit $20

Now lets look at an allup
$20 bet winner @1.50 x winner @$1.50 return $45.00 profit $25.00

For allup place bets to be any good you realy need high place dividends or at least 3 place wins in a row.

I used to use a combo win/place bet once on 2 horses
1 unit win x win allup
1 unit win x place allup
1 unit place x win allup
3 units place x place allup

depending on the price if both place at least you got a small profit and if both won you made a good profit, saying this nothing beats putting the whole amount on both to win allup.