TESS light curves and periodograms of GJ 1284 (top), GJ 898 (middle) and GJ 897 (bottom). Left: TESS photometric time series. Middle: GLS periodogram of the photometric time series. Right: light curve phase-folded with the selected rotation periods in Table 2. We adjust the ordinate axis range to crop the stellar flares to better visualise the variations in the light curve due to the stellar rotation. The colours in all the panels correspond to data from Sector 2 (blue) or Sector 29 (red) or both combined (black).