I'll offer one approach:
Small omnis or "near omnis" with little to no bass like those from Ohm, Mirage, Gallo. or even Sunfire (the CRM is dipole, but maybe worth thinking about, anyway). The wide dispersion should help mitigate the irregular placement and the lack of bass will mitigate any undesireable low frequency room effects attendent to the odd positioning. Add a small sub to fill out the bandwidth.
Good luck
Marty
Small omnis or "near omnis" with little to no bass like those from Ohm, Mirage, Gallo. or even Sunfire (the CRM is dipole, but maybe worth thinking about, anyway). The wide dispersion should help mitigate the irregular placement and the lack of bass will mitigate any undesireable low frequency room effects attendent to the odd positioning. Add a small sub to fill out the bandwidth.
Good luck
Marty