The biggest problem with split target wagers, is that, at best, one side is automatically lost, and a continuing forfeit of 9-10 jetons per spin will grind you down.
Pick one side or the other, place eight jetons on the zero sector (Two on 26, and one each on 12, 35, 3, 0, 32 and 15),
OR, play an eight piece tune on heavy centre tierce, (5-8 cheval, 8-11 cheval, 10 en plein, 13-16 cheval, 23 en plein, 24-27 cheval, 30 en plain, 33-36 cheval.
The 4 numbers at the centre are 8, 10, 23 and 30, with 4 cheval results on each side.
Just a suggestion to consider, but either option provides an added reward at the centre, and your bank will survive twice as long as before.