ΛLTB and nuisance 68% (darker color) and 95% (lighter color) confidence contours for our realistic case, in which we considered Gaussian priors for the nuisance parameters in Table 1 in the calibration of the scaling relations. Here, we show the forecasts for the baseline (gray), and we also include secondary probes in the contours (Euclid + Rubin + DESI (black), Euclid + Rubin + eROSITA (pink), and finally Euclid + Rubin + DESi + eROSITA (red)).