SPHERE DPMs for the moderately inclined systems. The blue regions with contours at 99.7%, 95%, and 50% indicate the probability of detecting a planet at a 5σ level with SPHERE. For three systems, HD 92945, HD 107146, and HD 206893, the 99.7% JWST/MIRI F1140C contour is shown in red for comparison. The orange hatched areas denote the 3R_Hill regions from the disc edges, where 1R_Hill is defined as Eq. (1). Constraints from Gaia RUWE are indicated by grey dotted regions. The light blue curve marks the mass and location of a planet required to explain the significant proper motion anomaly. In systems with known planets, their positions are shown as orange dots.