  This paper presents the first HI results extracted from the SARAO MeerKAT
Galactic Plane Survey (SMGPS) $-$ a narrow strip ($b \sim 3^\circ$) along the
southern Milky Way. The primary goal consisted in tracing the Great Attractor
(GA) Wall across the innermost Zone of Avoidance. We reduced a segment spanning
the longitude range $302^\circ \leq \ell \leq 332^\circ$ for the redshift range
$z \leq 0.08$. The superb SMGPS sensitivity (rms = 0.3-0.5 mJy beam$^{-1}$ per
44 kms$^{-1}$ channel) and angular resolution ($\sim$ 31" $\times$ 26") lead to
a detection limit of log$(M_{\rm HI}/$M$_\odot) \geq$ 8.5 at the GA distance
($V_{\rm hel} \sim 3500 - 6500$ kms$^{-1}$). A total of 477 galaxy candidates
were identified over the full redshift range. A comparison of the few HI
detections with counterparts in the literature (mostly HIZOA) found the HI
fluxes and other HI parameters to be highly consistent. The continuation of the
GA Wall is confirmed through a prominent overdensity of $N = 214$ detections in
the GA distance range. At higher latitudes, the wall moves to higher redshifts,
supportive of a possible link with the Ophiuchus cluster located behind the
Galactic Bulge. This deep interferometric HI survey demonstrates the power of
the SMGPS in improving our insight of large-scale structures at these extremely
low latitudes, despite the high obscuration and continuum background.
